There are used to compare the memory locations of two operators.
Example:
#!/usr/bin/python
a = 20
b = 20
if ( a is b ):
print “Line 1 – a and b have same identity”
else:
print “Line 1 – a and b do not have same identity”
if ( id(a) == id(b) ):
print “Line 2 – a and b have same identity”
else:
print “Line 2 – a and b do not have same identity”
b = 30
if ( a is b ):
print “Line 3 – a and b have same identity”
else:
print “Line 3 – a and b do not have same identity”
if ( a is not b ):
print “Line 4 – a and b do not have same identity”
else:
print “Line 4 – a and b have same identity”
Output:
Line 1 – a and b have same identity
Line 2 – a and b have same identity
Line 3 – a and b do not have same identity